Liquid-fuel burner.



P. D. JOHNSON.

LIQUID FUEL BURNER.

APPLICATION FILED MAR. 13, 1916.

1,225,? l 6., Patented May 8, 1917.

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P. D. JOHNSON.

LIQUID FUEL BURNER.

APPLICATION FILED M'AR.!3,19l6.

Patented May 8, 1917.

4 SHEETS-SHEET 2.

P. D. JOHNSON.

LIQUID FUEL BURNER.

1,225,716; I APPLICATION man MAR. 1a. 1916. PatentedvMay 8,1917.

4 SHEETS-SHEET 3.

P. D. JOHNSON.

LIQUID FUEL BURNER.

APPLICATION FILED MAR. 13. 1916.

Patented May 8, 1917.

4 SHEETS-SHEET 4.

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PHILIP D. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOB OF ONE-HALF TO CHARLES A. BROWN, OF HINSDALE, ILLINOIS.

LIQUID-FUEL BURNER.

Application filed March 13, 1916.

To all whom it may concern:

Be it known that I, PHILIP D. Jonxson, a citizen of the United States, residing at Chicago, in the county of Cook and Stateof Illinois, have invented a certain new and useful Improvement in Liquid-Fuel Burrr ers, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to liquid fuel burners, more particularly of the vaporizing type.

The burner which I shall describe is of the type adapted for use with the boiler of a well known make of steam automobiles, but it is to be understood that the burner is adapted for other uses as well, as will be apparent from the following specification.

Burners adapted for this class of use, due to limitations in space and weight, must, of necessity, be made as light and compact as possible. Inasmuch as the vaporizing type of burner is unavoidably subject t more or less clogging due to carbonization and nonvaporizable residue, it is desirable that provision be made for cleaning and renewing in order to entail as little inconvenience upon the attendant as possible.

It is an object of my invention to provide an improved burner structure which is compact, but at the same time accessible for cleaning and repairing with minimum diiiiculty or expense. I

It is a further object to provide an improved construction of pilot for the burner which pilot will be reliable, compact and at the same time readily accessible.

In the accompanying drawings which form a part of the present specification, I have illustrated one embodiment of my invention.

Figure 1 is a top plan view of the burner and pilot in assembled position;

Fig. 2 is a vertical cross section ofthe burner looking toward the front;

Fig. 3 is a fragmentary section showing the pilot burner and the front part of the main burner in side elevation;

Fig. 4 is a front elevation of the :asing and discharge nozzles of the main burner and the pilot burner;

Fig. 5 is a top plan view of the front housing for the main and for the pilot burner Specification of Letters Patent.

Patented May 8, 1917.

Serial No. 83,704.

Fig. 6 is a top plan view of the pilot burner casting;

Fig. 7 is a front elevation of the same;

Fig. 8 is an isometric view of the front part of the housing for supporting the pilot burner vaporizer and nozzle;

Fig.9 is a fragmentary cross sectional view of the pilot burner nozzle and needle valve; and

Fig. 10 is an isometric view of the rear half of the housing which supports the main burner vaporizing tubes and nozzles and the outer end of the mixing tube.

The main burner casting 1 is provided witha plurality of ridges, the crests of which are slotted as shown in Figs. 1 and 2 to permit the oil vapor which is mixed with air for combustion to pass up to the combustion chamber which is formed in part by the surrounding shell 3. This shell may be extended to any desired height. At the front of the shell 3 a housing 4 is secured. This housing is composed of two parts, namely the base 5 and the cap 6. The base is bolted to the surrounding shell 3 and forms a support for the cap part 6 as will be de scribed in detail later. A pair of vapor izing tubes 7 and 8, which are joined together at the rear end by a suitable manifold 9, extend through the rear of the shell 3 and-are fastened at the front to the connecting blocks 10 and 11, respectively. The connecting blocks 10 and 11 are provided with extensions or studs 12 and 13, the upper ends of which extend through the top of the base 5 of the housing 4 and are secured by means of the nuts 14: and 15. This arrangement holds the ends of the tubes 7 and 8 securely in place. The blocks 10 and 11 are hollowed out to form communicating passages between the nozzles 16 and 17, and the vaporizing tubes 7 and 8 respectively.

The nozzles 16 and 17 are provided with suitable tips 18 and 19 which are brought axially into line with the mixing tubes 20 and 21 of the'main burner. Suitable cleaning passages which are normally closed by the screws 22, 23 and 24, are provided on each of the nozzles.

I have found it advisable to form the tips 18 and 19 of separate pieces in order to permit of easy cleaning or renewal of the tips. If the passage of the tip cannot readily be cleared of obstruction by withdrawing the screw 23, the tip itself may be unscrewed and a new one substituted.

In order to supply the heat lost by radiation from the housing 4 to as great a degree as possible, I have provided a projecting tongue 25 which projects into the furnace and is heated by the main burner.

The heat which is lost by radiation and conduction from the housing 4 is thus supplied directly from the furnace rather than being supplied from the vaporizing tubes 7 and 8 or their connected parts. This tends to'keep the vaporizing tubes and nozzles hot at all times and promotes efficient operation of the burner.

The manifold 9 which connects the tubes 7 and 8 together is connected to the preheating tube 26. The preheating tube 26 enters the furnace at the rear at a point adjacent the manifold 9 and is laid around the periphery of the shell 3 passing over the top of the vaporizing tubes 7 and 8 and over the top of the pilot burner as may be seen in Fig. 2, then finally connecting with the manifold 9 by means of a suitable union 27. The raised portion 75 (see Fig. 2) which passes over the top of the vaporizing tubes forms a trap for the oil which, when the burner is in operation, prevents surging due to tilting or jarring of the burner.

The pilot burner is provided with aburner casting 28, the forward end of which has the projection 29 that is slotted to receive a screw bolt 30 which is secured at the bottom of the central groove, as is shown in Fig. 2. This arrangement holds the inner end of the pilot burner casting firmly in place. The front end of the burner casting 28 is provided with projecting portions 31 and 32 which extend forward between the pilot burner nozzle 34 which rests in the groove 33 and the two main burner nozzles 16 and 17 which rest in the-grooves or notches 35 'and 36 respectively. The projecting parts 31 and 32 are hollowed out and plugged at their outer ends. These parts communicate with the interior of the main portion of the casting and are provided with slots so as to form part of the pilot burner and to maintain a flame above them to heat the front part of the pilot burner vaporizer and nozzle and the front part of the main burner vaporizers and nozzles. The pilot burner casting 28 is provided with a pair of wings 37 and 38 which form a closure for the bottom portion of the housing base 5.

The cap 6 forms a closure for the front of the base 5 and also forms a support for the front end of the pilot burner vaporizer and nozzle. The cap 6 is fastened by means of screws 39 to the base 5, formingin real- I ity a plate for closing off the front portion of the base 5. The pilot burner is provided with a pair of vaporizing tubes 40 and 41 which are connected together at their inner ends by means of the block 42, this block having a suitable passageway therethrough to form a continuation of the tubes and to put the same in communication. The block is perforated at suitable points to permit of cleaning of the interior thereof and of the interiorof the vaporizing tubes 40 and 41. These apertures are closed by means of screws 43 and 44 and by a pointed pin 45 which support the inner ends of. the pilot vaporizing tubes. The pointed pin 45 rests in a hole in the block or bracket 46 which is connected to the vaporizing tubes 7 and 8 of the main burner. The front end of the pilot vaporizer tubes 40 and 41 and the fit into a depression 51 in the top of the 7 section 5. The block 47 has a passageway therethrough and the upper vaporizing tube 40 has an extension passing therethrough, as shown in Figs. 8 and 9, which is threaded to connect with the block 53 upon the outside or front of the plate 6. The front end of the vaporizing tube 40 passes through an opening 54 in the cap 6, which opening is conformed to embrace the tube and to provide also a sight opening for viewing the action of the pilot burner and the main burner. The opening 54 is surrounded by a flange 55, the outeredge of which is machined off or surfaced in order to form a tight --joint with the swinging cover plate 56 which embraces the outer end of the vaporizing tube 40 as shown in Fig. 5. A screw 57 is provided for clamping the swinging closure 56 in closed position.

The block 47 is provided with a passage 58 which connects the nozzle 34 'with the vaporizing tube 41. 'The vaporizing tube- 41 has its outer end reduced to form "a shoulder 59 which is held against the side of the block 47 by means of the screw cap60 which is threaded upon the outer end of the reduced portion of the tube 41. This cap forms a seat against the side of the block 47.. The front of the vaporizing tube 41 is plugged as by means of the screws 61. The nozzle 34 is provided with a suitable stud or shell 62 for supportingthe needle valve 63,

the outer end of which is squared, as shown at 64 in Fig. 4. A suitable packing gland 65 is provided at the outer end of'theshell 62. for preventing escape of the oil vapors.

The inner end of the valve-stem 63 is pro- 7 vided with a needle point 66 which, inoconjunction with the tip 67, forms a suitable regulating valve for the burner.

The passage 58 which is formed in the nozzle 34 extends through the nozzle, the outer end being closed by the screw 68.

I have provided a novel manner of closing off the cleaning passages by forming a conical face on the end of the screw 68 and forming a eorrespondin g conical seat around the edges of the passage 58 which seat is smaller than the counter bore in which the threads of the screw are secured. In this manner, the closure is formed between the end of the screw and the metal of the seat. The threads of the screw form additional sealing means although the screw surfaces are not relied upon for forming the seal or closure. I prefer to form the screws 22, 23 and 24 in the main burner and other similar screws for closing off cleaning passages in the same manner as I find that a much better closure can be secured than where the screw surfaces or the surface of the head of the screw is depended upon to form the closure. There is also less danger of marring or scoring the surfaces which are depended upon for a joint.

The tip 67 of the pilot nozzle is brought into line with the mixing tube 69 (see Fig. 7) which is partly cut away at its lower half in order to permit free entry of the air for supporting combustion. The mixing tubes 20 and 21 of the main burner have their outer ends formed with projecting lips 70 and 71 which extend forward far enough to prevent these mixing tubes, when in action, from robbing the pilot burner of the air necessary to support combustion. This construction insures that a steady supply of air will reach the pilot burner whether the main burner is in operation or not.

It will be apparent from the above that all that is necessary in order to remove the pilot burner is to loosen the screws 39 which hold the cap 6 upon the base 5. The entire pilot burner may then be withdrawn for such inspection or cleaning as may be necessary. Cleaning of the vaporizing tube 40 may readily be effected by removing the screws 7 3 and 4A or by removing either one of them singly. In a similar manner, the vaporizing tube 41 may be cleaned by the removal of the cap 60 and the plug 61 or by the removal of the pointed plug 45. It is to be noted that the vaporizing tube 40 lies loosely in the passageway through the block 41-7 in order to permit contraction and expansion due to heating of the tube 41 which is secured rigidly to the block 47. No communication is effected between the tube 40 and the block 4.7, this block serving merely as a support and guide for the tube 40.

The main burner vaporizing tubes 7 and 8 and the nozzles 16 and 17 may be cleaned with equal facility. In order to remove the vaporizing tubes, a screw cap at the rear, which secures the tubes to the manifold 9,

is loosened, the holding nuts 14 and 15 are released and the tubes may be withdrawn. It is to be noted that these operations may be performed without removing the main burner casting from its fixed position with respect to the boiler or other device to be heated.

What I claim is:

1. In combination a main burner, a shell surrounding said main burner, a mixing tube for said burner, a housing mounted on said shell, said housing comprising a base portion and a cap portion, a vaporizing tube extending through said shell over and along said burner and projecting into said housing, a nozzle for said mixing tube, a connecting block joining said vaporizing tube and said nozzle, said block having a readily releasable threaded stud secured to the base of said housing, said cap being readily removable to permit said vaporizing tube and block to be withdrawn through said base.

2. In combination a main burner, a shell surrounding said main burner, a mixing tube for said burner, a housing mounted on said shell, said housing comprising a base portion and a cap portion, a vaporizing tube extending over and along said burner and projecting into said housing, a nozzle for said mixing tube, said nozzle extending into said housing, a connecting block joining said vaporizing tube and said nozzle, said block having a stud secured to the base of said housing, said cap being readily removable to permit withdrawal of said block, said nozzle and said vaporizing tube, and a tongue forming a part of said housing, said tongue extending over said main burner to be heated thereby.

3. In combination a main burner, a shell surrounding said main burner, a housing mounted on said shell, said housing comprising a base portion and a cap portion, said base portion being open at its bottom, a pair of vaporizing tubes extending over and along said burner and projecting, into said housing, a nozzle for each of said vaporizing tubes, separate connecting blocks for joining each of said vaporizing tubes to the corresponding nozzle, a stud for each block to secure the same to the base of said housing, and a pilot burner having means for closing ofl the bottom of the base portion of said housing, said pilot burner having portions of its active surface extending below said connecting block.

4. In combination a pair of vaporizing tubes, a housing comprising a base and a cap therefor, said tubes projecting into said housing, a pair of nozzles, connecting blocks for joining said tubes and saidnozzle, a bracket secured to said vaporizingtubes, a pilot burner vaporizer secured to said cap, said vaporizer being adapted to have its end supported by said'bracket, and means forremovably securing said cap to the front of said base.

5. In combination a main burner having a grooved or corrugated face, a shell surrounding said main burner, a housing mounted on said shell, said housing comprising a base portion open atithe front and at the bottom and a cap for closing said front, vaporizing tubes pro ecting into sald houslng, said tubes havmg'nozzles for feed- 'ing said main burner, a pilot burner having a plate for closing off the bottom of said base, said pilot burner having a portion 7 adapted to project into said'housingto heat the end of said vaporizing tube, said pilot" burner having a split lug secured to the inner end thereof, and a pin mounted on said main burner for holding said split on said shell, said housing 'compris'ing'a base portion and acap portlon, said base being open at its bottom, a pilot burner hav ing a fiat'plate for closing the bottom of said housing, said pilot burner having a;

split lug at the inner end thereof, and a pin on said main burner for cooperatingwith ing their ends joined together, a nozzle secured to said block and communicating with said second tube, andmeans to support said block. a r

In combination a main burner, a shell surrounding said burner, a housing mounted '8. In combination-a block, 'atube loosely projecting through said a block,"- a seco'nd tube projecting through said block, said second tube having a shoulder for forming a joint with one side of saidblock, screw threaded means for engaging the end of said second tube for forming a joint on, the

other side of said block, said block having};

of said tubes together, a nozzle securedto a passagein communication withsaidfsec- 0nd tube, means for oining the outer ends" said block and communic-ating' withlsaid;

tubes, and astud for supporting said blocks V 9. In combination an open housing, a plate for closing said housing,.a bloclnsaid:

block having a passageway therethrough, a tube lying loosely in saidpassageway, a second tube rigidly secured to said block, said block having a passageway in communication with said second tube, meansfor joining said tubes together, a nozzle secured to said block and communicating with'saidsecond tube, and a screw bolt for securing said block to'said plate.

10.: In a burner, a metal ,block having two passages therethrough substantially at right angles, a lug or body 'of'metal in line" Y with one of said passages, said lug having a 7 conical seat formed in the bottom thereof, j V

a counterbore of a diameter greater than saldseat, and a machine screw threaded into said counterbore, said screw having'ia' conical end to cooperate with said seat for closing ofl said passage. f

In witness whereof, I hereunto subscribe my name this 10th day, of March, A. ID. 1916.

PHILII? 'D JOHNSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of'latents,

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